Israel more than enough has the ability, we're not talking Gaza level, Gaza was just flattened. They cant flatten Lebanon, but they sure can knock out key infrastructure several times over and just send their economy back a few decades, rinse repeat and Lebanon would always be 'catching up'.Israel don't have that ability lol.
They could do it on Gaza because it is an incredibly little place, but the whole of Lebanon not only is far, far bigger with way more cities and buildings.
Hezbollah also very much has the ability to strike back at Israeli mitary bases, including airbases.
Also, it is doubtful that Israel even has enough munitions to even do a repeat of Gaza bombing in the shorter time frame (a yearish).
And after last night's debate we saw that Biden is NOT in control, he probably has little momentary clue on what's going on but his cabinet is, which is all staunchly pro-Israel, so US support is guaranteed.